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<li class="level2"><a href="#walkthrough">Walkthrough</a></li>
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<h1 class="title">QML Dynamic View Ordering Tutorial 1 - A Simple ListView and Delegate</h1>
<span class="subtitle"></span>
<!-- $$$tutorials/dynamicview/dynamicview1-description -->
<div class="descr"> <a name="details"></a>
<p>We begin our application by defining a <a href="qml-qtquick-listview.html">ListView</a>, a model which will provide data to the view, and a delegate which provides a template for constructing items in the view.</p>
<p>The code for the <a href="qml-qtquick-listview.html">ListView</a> and delegate looks like this:</p>
<pre class="qml">
import QtQuick 2.0
<span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> {
<span class="name">id</span>: <span class="name">root</span>
<span class="name">width</span>: <span class="number">300</span>; <span class="name">height</span>: <span class="number">400</span>
<span class="type">Component</span> {
<span class="name">id</span>: <span class="name">dragDelegate</span>
<span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> {
<span class="name">id</span>: <span class="name">content</span>
<span class="type">anchors</span> { <span class="name">left</span>: <span class="name">parent</span>.<span class="name">left</span>; <span class="name">right</span>: <span class="name">parent</span>.<span class="name">right</span> }
<span class="name">height</span>: <span class="name">column</span>.<span class="name">implicitHeight</span> <span class="operator">+</span> <span class="number">4</span>
<span class="name">border</span>.width: <span class="number">1</span>
<span class="name">border</span>.color: <span class="string">"lightsteelblue"</span>
<span class="name">radius</span>: <span class="number">2</span>
<span class="type"><a href="qml-qtquick-column.html">Column</a></span> {
<span class="name">id</span>: <span class="name">column</span>
<span class="type">anchors</span> { <span class="name">fill</span>: <span class="name">parent</span>; <span class="name">margins</span>: <span class="number">2</span> }
<span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">text</span>: <span class="string">'Name: '</span> <span class="operator">+</span> <span class="name">name</span> }
<span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">text</span>: <span class="string">'Type: '</span> <span class="operator">+</span> <span class="name">type</span> }
<span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">text</span>: <span class="string">'Age: '</span> <span class="operator">+</span> <span class="name">age</span> }
<span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">text</span>: <span class="string">'Size: '</span> <span class="operator">+</span> <span class="name">size</span> }
}
}
}
<span class="type"><a href="qml-qtquick-listview.html">ListView</a></span> {
<span class="name">id</span>: <span class="name">view</span>
<span class="type">anchors</span> { <span class="name">fill</span>: <span class="name">parent</span>; <span class="name">margins</span>: <span class="number">2</span> }
<span class="name">model</span>: <span class="name">PetsModel</span> {}
<span class="name">delegate</span>: <span class="name">dragDelegate</span>
<span class="name">spacing</span>: <span class="number">4</span>
<span class="name">cacheBuffer</span>: <span class="number">50</span>
}
}
</pre>
<p>The model is defined in a separate QML file which looks like this:</p>
<pre class="qml">
import QtQuick 2.0
<span class="type">ListModel</span> {
<span class="type">ListElement</span> {
<span class="name">name</span>: <span class="string">"Polly"</span>
<span class="name">type</span>: <span class="string">"Parrot"</span>
<span class="name">age</span>: <span class="number">12</span>
<span class="name">size</span>: <span class="string">"Small"</span>
}
<span class="type">ListElement</span> {
<span class="name">name</span>: <span class="string">"Penny"</span>
<span class="name">type</span>: <span class="string">"Turtle"</span>
<span class="name">age</span>: <span class="number">4</span>
<span class="name">size</span>: <span class="string">"Small"</span>
}
}
</pre>
<a name="walkthrough"></a>
<h3 >Walkthrough</h3>
<p>The first item defined within the application's root Rectangle is the delegate Component. This is the template from which each item in the <a href="qml-qtquick-listview.html">ListView</a> is constructed.</p>
<p>The <code>name</code>, <code>age</code>, <code>type</code>, and <code>size</code> variables referenced in the delegate are sourced from the model data. The names correspond to roles defined in the model.</p>
<pre class="qml">
<span class="type">Component</span> {
<span class="name">id</span>: <span class="name">dragDelegate</span>
<span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> {
<span class="name">id</span>: <span class="name">content</span>
<span class="type">anchors</span> { <span class="name">left</span>: <span class="name">parent</span>.<span class="name">left</span>; <span class="name">right</span>: <span class="name">parent</span>.<span class="name">right</span> }
<span class="name">height</span>: <span class="name">column</span>.<span class="name">implicitHeight</span> <span class="operator">+</span> <span class="number">4</span>
<span class="name">border</span>.width: <span class="number">1</span>
<span class="name">border</span>.color: <span class="string">"lightsteelblue"</span>
<span class="name">radius</span>: <span class="number">2</span>
<span class="type"><a href="qml-qtquick-column.html">Column</a></span> {
<span class="name">id</span>: <span class="name">column</span>
<span class="type">anchors</span> { <span class="name">fill</span>: <span class="name">parent</span>; <span class="name">margins</span>: <span class="number">2</span> }
<span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">text</span>: <span class="string">'Name: '</span> <span class="operator">+</span> <span class="name">name</span> }
<span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">text</span>: <span class="string">'Type: '</span> <span class="operator">+</span> <span class="name">type</span> }
<span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">text</span>: <span class="string">'Age: '</span> <span class="operator">+</span> <span class="name">age</span> }
<span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">text</span>: <span class="string">'Size: '</span> <span class="operator">+</span> <span class="name">size</span> }
}
}
}
</pre>
<p>The second part of the application is the <a href="qml-qtquick-listview.html">ListView</a> itself to which we bind the model and delegate.</p>
<pre class="qml">
<span class="type"><a href="qml-qtquick-listview.html">ListView</a></span> {
<span class="name">id</span>: <span class="name">view</span>
<span class="type">anchors</span> { <span class="name">fill</span>: <span class="name">parent</span>; <span class="name">margins</span>: <span class="number">2</span> }
<span class="name">model</span>: <span class="name">PetsModel</span> {}
<span class="name">delegate</span>: <span class="name">dragDelegate</span>
<span class="name">spacing</span>: <span class="number">4</span>
<span class="name">cacheBuffer</span>: <span class="number">50</span>
}
</pre>
<p>Files:</p>
<ul>
<li><a href="qtquick-tutorials-dynamicview-dynamicview1-petsmodel-qml.html">tutorials/dynamicview/dynamicview1/PetsModel.qml</a></li>
<li><a href="qtquick-tutorials-dynamicview-dynamicview1-dynamicview-qml.html">tutorials/dynamicview/dynamicview1/dynamicview.qml</a></li>
<li><a href="qtquick-tutorials-dynamicview-dynamicview1-dynamicview1-qmlproject.html">tutorials/dynamicview/dynamicview1/dynamicview1.qmlproject</a></li>
</ul>
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